“Natural Gas yes, not some much oil. We don’t really use oil for electrical power generation. Much of what is used is refinery “leftovers” that are not useful for transportation fuel in the US.”
Yes, back in the early 80’s when in tech school we visited New Haven Harbor station in CT. I believe they used #6 residual oil brought in on barges and they needed to heat it to 140 degrees for it to flow. It was like petroleum jelly.
Also some petroleum coke is burned. Not much different than coal in how it is handled but it is counted as “oil” in the generation numbers.